If the Achilles tendon stalks, the emergency surgery involves the ligation and the recovering of the tendon of interest. The interest in physical therapy is for a model that would allow adjustment dorsifled stages, the number of degrees, and the final stage the same orthosis to submit a joint motion for free care. The Comarna orthosis solution is for these stages, a cut in the leg support in making a dynamic orthosis to assist. The paper addresses the leg in terms of biomechanical and choosing the right type of mechanism.